diff --git a/.gitignore b/.gitignore
index 9cf97601a332277f5b5fd81a9efeefcf676b2c2c..acc2ff714e86ea0166e8b1c783e1d6c6e4117897 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,6 @@ syntax: glob
 *.pyc
 *.pyo
 __pycache__/
-*.*~
\ No newline at end of file
+*.*~
+.mypy_cache
+
diff --git a/omemo/backend/liteaxolotlstore.py b/omemo/backend/liteaxolotlstore.py
index 231969e780cc5ef988297cc7770f82580e2a27c3..31f6dfb1b5c34261f392707e937ad627b1869392 100644
--- a/omemo/backend/liteaxolotlstore.py
+++ b/omemo/backend/liteaxolotlstore.py
@@ -18,6 +18,7 @@
 import time
 import sqlite3
 from collections import namedtuple
+from typing import List
 
 from axolotl.state.axolotlstore import AxolotlStore
 from axolotl.state.signedprekeyrecord import SignedPreKeyRecord
@@ -229,7 +230,7 @@ class LiteAxolotlStore(AxolotlStore):
                 CREATE TABLE IF NOT EXISTS secret (
                     device_id INTEGER, public_key BLOB, private_key BLOB);
                 INSERT INTO secret (device_id, public_key, private_key)
-                SELECT registration_id + 1, public_key, private_key 
+                SELECT registration_id + 1, public_key, private_key
                 FROM identities
                 WHERE recipient_id = -1;
             """
@@ -540,7 +541,7 @@ class LiteAxolotlStore(AxolotlStore):
         result = self._con.execute(query, (recipientId, public_key)).fetchone()
         return result.trust if result is not None else None
 
-    def getFingerprints(self, jid):
+    def getFingerprints(self, jid: str) -> list:
         query = '''SELECT recipient_id as "recipient_id [jid]",
                           public_key as "public_key [pk]",
                           trust,
@@ -549,7 +550,7 @@ class LiteAxolotlStore(AxolotlStore):
                    WHERE recipient_id = ? ORDER BY trust ASC'''
         return self._con.execute(query, (jid,)).fetchall()
 
-    def getMucFingerprints(self, jids):
+    def getMucFingerprints(self, jids: List[str]) -> list:
         query = '''
             SELECT recipient_id as "recipient_id [jid]",
                    public_key as "public_key [pk]",
diff --git a/omemo/backend/util.py b/omemo/backend/util.py
index f63801c30c761b2a0d98c4bba564aae3108d94b1..edc31482d7e3c18c811fc56c349c5013011dc906 100644
--- a/omemo/backend/util.py
+++ b/omemo/backend/util.py
@@ -34,6 +34,8 @@ class Trust(IntEnum):
     UNDECIDED = 2
 
 
+# This is not a method of IdentityKeyExtended, because we also want to use it
+# for axolotl.identitykey.IdentityKey
 def get_fingerprint(identity_key, formatted=False):
     public_key = identity_key.getPublicKey().serialize()
     fingerprint = binascii.hexlify(public_key).decode()[2:]
@@ -52,5 +54,5 @@ class IdentityKeyExtended(IdentityKey):
     def __hash__(self):
         return hash(self.publicKey.serialize())
 
-    def get_fingerprint(self, formatted=False):
+    def get_fingerprint(self, formatted: bool = False) -> str:
         return get_fingerprint(self, formatted=formatted)
diff --git a/omemo/plugin.py b/omemo/plugin.py
index 40dc694a69f3a44c2638c217b40f5609687760ef..e37982a4d9a867e41358a533365b01c943311a84 100644
--- a/omemo/plugin.py
+++ b/omemo/plugin.py
@@ -21,6 +21,7 @@ import binascii
 import threading
 from enum import IntEnum, unique
 from pathlib import Path
+from typing import Dict
 
 from gi.repository import GLib
 from gi.repository import Gtk
@@ -28,6 +29,7 @@ from gi.repository import Gdk
 
 from gajim import dialogs
 from gajim.common import app, ged
+from gajim.common.const import Trust as GajimTrust
 from gajim.plugins import GajimPlugin
 from gajim.plugins.plugins_i18n import _
 from gajim.groupchat_control import GroupchatControl
@@ -36,6 +38,7 @@ from omemo import file_crypto
 from omemo.gtk.key import KeyDialog
 from omemo.gtk.config import OMEMOConfigDialog
 from omemo.backend.aes import aes_encrypt_file
+from omemo.backend.util import IdentityKeyExtended, Trust
 
 
 AXOLOTL_MISSING = 'You are missing Python3-Axolotl or use an outdated version'
@@ -329,3 +332,21 @@ class OmemoPlugin(GajimPlugin):
         if msg is None:
             return
         chat_control.print_conversation_line(msg, 'status', '', None)
+
+    def get_fingerprints(self, account: str, jid: str,
+                         groupchat: bool = False) -> Dict[str, GajimTrust]:
+        omemo = self.get_omemo(account)
+
+        if groupchat:
+            members = list(omemo.backend.get_muc_members(jid))
+            fpr_list = omemo.backend.storage.getMucFingerprints(members)
+        else:
+            fpr_list = omemo.backend.storage.getFingerprints(jid)
+
+        # every row is like:
+        # recipient_id: str, public_key: omemo.backend.util.IdentityKeyExtended, trust: int, timestamp: Optional[int]
+        # FIXME, that code is awful
+        return {
+            row.public_key.get_fingerprint(): GajimTrust[Trust(row.trust).name]
+            for row in fpr_list
+        }